Refactor CLI command system to support async execution and central command history

UI/CLI/Commands/ClearCommand.cs

@@ -6,8 +6,9 @@ public sealed class ClearCommand : ICommand
 
     public string Description => "Clear the screen";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         Console.Clear();
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/HaltCommand.cs

@@ -6,9 +6,10 @@ public sealed class ShutdownCommand : ICommand
 
     public string Description => "Shutdown the system";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         printLine("Shutting down system...");
         Sys.Power.Shutdown();
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/HelpCommand.cs

@@ -6,7 +6,7 @@ public sealed class HelpCommand : ICommand
 
     public string Description => "Show this help message";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         printLine("Available commands:");
 
@@ -14,5 +14,7 @@ public sealed class HelpCommand : ICommand
         {
             printLine($"  {command.Name,-12} - {command.Description}");
         }
+
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/ProcessCommands.cs

@@ -9,7 +9,7 @@ public sealed class SpawnProcessCommand : ICommand
 
     public string Description => "Spawn a new process";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         arguments = arguments?.Trim();
 
@@ -29,6 +29,7 @@ public sealed class SpawnProcessCommand : ICommand
             printLine("Usage: spawn <process-name>");
             printLine("Available processes: test, terminal");
         }
+        return Task.CompletedTask;
     }
 }
 
@@ -38,7 +39,7 @@ public sealed class ListProcessesCommand : ICommand
 
     public string Description => "List running processes";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         IEnumerable<Process> processes = ProcessManager.GetAllProcesses();
 
@@ -48,6 +49,8 @@ public sealed class ListProcessesCommand : ICommand
         {
             printLine($"  ID: {process.Id}, Name: {process.Name}");
         }
+
+        return Task.CompletedTask;
     }
 }
 
@@ -57,23 +60,24 @@ public sealed class StopProcessCommand : ICommand
 
     public string Description => "Stop a process by ID";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         string? idText = arguments;
 
         if (string.IsNullOrWhiteSpace(idText))
         {
             printLine("Usage: stop <process-id>");
-            return;
+            return Task.CompletedTask;
         }
 
         if (int.TryParse(idText, out int processId))
         {
             ProcessManager.StopProcess(processId);
             printLine($"Stopped process with ID {processId}");
-            return;
+            return Task.CompletedTask;
         }
 
         printLine("Invalid process ID");
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/RebootCommand.cs

@@ -6,9 +6,10 @@ public class RebootCommand : ICommand
 
     public string Description => "Reboot the system";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         printLine("Rebooting system...");
         Sys.Power.Reboot();
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/StartGuiCommand.cs

@@ -8,14 +8,14 @@ public class StartGuiCommand : ICommand
     public string Name => "start-gui";
     public string Description => "Starts the Graphical User Interface (Desktop Process)";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         printLine("Starting Desktop Process...");
 
         if (ProcessManager.IsProcessRunning<DesktopProcess>())
         {
             printLine("Desktop Process is already running.");
-            return;
+            return Task.CompletedTask;
         }
 
         foreach (Process process in ProcessManager.GetProcessesOfType<CliProcess>())
@@ -24,5 +24,6 @@ public class StartGuiCommand : ICommand
         }
 
         _ = ProcessManager.SpawnProcess<DesktopProcess>();
+        return Task.CompletedTask;
     }
 }

UI/CLI/Commands/StopGuiCommand.cs

@@ -8,7 +8,7 @@ public class StopGuiCommand : ICommand
     public string Name => "stop-gui";
     public string Description => "Stops the Graphical User Interface (Desktop Process)";
 
-    public async void Execute(string? arguments, Action<string> printLine)
+    public async Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         printLine("Stopping Desktop Process...");
 

UI/CLI/Commands/ViewProcessLogs.cs

@@ -9,7 +9,7 @@ public class ViewProcessLogs : ICommand
 
     public string Description => "View logs for a process";
 
-    public void Execute(string? arguments, Action<string> printLine)
+    public Task ExecuteAsync(string? arguments, Action<string> printLine)
     {
         if (int.TryParse(arguments, out int processId))
         {
@@ -21,6 +21,7 @@ public class ViewProcessLogs : ICommand
             IEnumerable<LogEntry> logs = ProcessManager.GetLogs();
             PrintLogs(logs, printLine);
         }
+        return Task.CompletedTask;
     }
 
     private static void PrintLogs(IEnumerable<LogEntry> logs, Action<string> printLine)